Test your powers of logic with these challenging Su Doku puzzles.You don’t need to be a mathematical genius to solve the treacherous puzzles in this collection of Fiendishly difficult puzzles – it’s simply a question of logic.The latest title in The Times Fiendish Su Doku series – previously unpublished quality Su Doku puzzles from The Times. Includes 180 Fiendish and 20 Super Fiendish puzzles. These will provide a stern challenge and take you to the next level.Since the first Su Doku puzzle appeared in The Times in November 2004, this classic game of logic has become a phenomenon, with over 5 million copies of the Times Su Doku series sold worldwide.Perfect for the advanced solver in need of a constant supply of ultra-difficult puzzles, and guaranteed to provide hours of mind-stretching entertainment.